I understand that double locking in Java is broken, so what are the best ways to make Singletons Thread Safe in Java? The first thing that springs to my mind is:

class Singleton{
    private static Singleton instance;

    private Singleton(){}

    public static synchronized Singleton getInstance(){
        if(instance == null) instance = new Singleton();
        return instance;
    }
}

Does this work? if so, is it the best way (I guess that depends on circumstances, so stating when a particular technique is best, would be useful)